29590-29520 bearing: complete specifications & equivalents
The 29590-29520 is a ANSI ABMA 19.2 radial bearing sized 66.675 x 107.95 x 25.4 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 66.675 mm |
| Outer diameter D | 107.95 mm |
| Width B | 25.4 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 101 kN |
| Basic static load rating C0 | 140 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 860 g |
| Manufacturer designation | NTN 4T-29590/29520 |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 4t-inch-series range
| Bore d | 2.625 in |
|---|---|
| Outer diameter D | 4.25 in |
| Width B | 1 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20.6 mm |
| Smallest bore in 4t-inch-series | 12.7 mm |
| Largest outer diameter in 4t-inch-series | 260 mm |
| Width range across 4t-inch-series | 10.998–77.788 mm |
| Bore position in 4t-inch-series (smallest first) | 84 of 148 |
| Bore above smallest 4t-inch-series size | 53.974999999999994 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 29590 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 29590-29520 model number is decoded
4T-29590/29520 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 66.675×107.95×25.4 mm (assembled width T), for a shaft of about 66.675 mm (2.625 in). Cone and cup of 4T-29590/29520 are separately stocked parts: a worn 29520 cup can be replaced against the existing 29590 cone, provided the new cup carries the identical reference — pairing across references changes the 25.4 mm assembled width and the rating. Contact-angle geometry of the pure-numeric inch family gives 4T-29590/29520 its radial/axial load split — at 101/140 kN the static rating is about 1.39× C, typical of inch tapered sets proportioned for combined duty. The printed 101/140 kN ratings belong to the assembled 29590+29520 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. A single-row tapered bearing reacts thrust in one direction only; 4T-29590/29520 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Mount the 66.675 mm cone by induction heating (max 120 °C) and the 107.95 mm cup with a press sleeve; at 860 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 66.675 mm bore (107.95×25.4 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 29590/29520 reference at purchase.
- ABMA makes the 66.675×107.95 mm envelope interchangeable, not the ratings: NTN prints 101/140 kN for this execution and another make of the same number can differ in roller complement.
- Fit selection follows the rotating ring: a rotating cone on a 66.675 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Grease packs must leave free volume inside the 25.4 mm-wide set; over-greasing a pair churning near the oil-band speed of 4,300 r/min raises temperature and destroys the setting.
- The 101/140 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-29590/29520; internal geometry legitimately differs between inch-series makers, so re-verify ratings, adjustment and the exact cone/cup references before substituting another brand on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-29590/29520?
4T-29590/29520 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 66.675 mm bore (2.625 in), 107.95 mm outside diameter and 25.4 mm assembled width T (4.25 × 1 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 101 kN, C0 140 kN, grease limiting speed 3,200 r/min, oil speed 4,300 r/min, mass about 860 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-29590/29520 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 29590 cone or the 29520 cup can be replaced by an identical reference from NTN or another ABMA-dimensioned maker. Pairing the cone with a different cup reference is a different catalogue row: OD, assembled T and the 101/140 kN ratings change with the cup.
What is the difference between 4T-29590/29520 and a metric ISO 355 tapered bearing?
4T-29590/29520 follows the ABMA inch boundary plan with cone/cup references; ISO 355 bearings use metric dimension-series numbers (302, 322, …). Even where a metric size looks close to 66.675×107.95×25.4 mm, the envelopes and contact angles differ — the two systems are not drop-in interchangeable; check every boundary value before substituting.
What does the 4T prefix on 4T-29590/29520 mean?
4T is NTN's tapered roller bearing quality mark, stamped on cone and cup in the factory. It identifies NTN's 4T programme and is not a dimension or variant code, so interchange lists quote the bare 29590/29520 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-29590/29520 list two speeds, 3,200 and 4,300 r/min?
The lower figure, 3,200 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-29590/29520 at 4,300 r/min because oil removes rib-contact heat better. Real limits still depend on pair adjustment, oil flow and cooling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.